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## Numbers & Operations - The Real & Complex Number Systems 201-210

### Course: Numbers & Operations - The Real & Complex Number Systems 201-210>Unit 3

Lesson 4: Multiply with partial products

# Multiplying 3-digit by 1-digit (regrouping)

Learn to multiply a 3-digit number by a 1-digit number using regrouping.  In this video, we will multiply 7x253. Created by Sal Khan.

## Want to join the conversation?

• okay so a lot of people say that the new way of this generation's math is very easy but it is actually very complicated. The old way is a lot easier so you schools that are doing great1
• I agree. It is very hard! I hope Sal Khan fixes it to be easier.
• Has anyone ever wondered 4 digit by 4 digit
• not really
• how do you solve it with 10 digits?//
• What do you mean by 10 digits? Multiple 10 digits with 10 digits?
• why are all these comments so long ag
• he said at 'carry appropriately' can you carry inappropriately
• what do you mean
(1 vote)
• What is 305 x 6?
• first
Multiply 300 by 6 which is 1800. Now you know your answer is at least 1800.
Next multiply 6 by the remaining number 05 which same as 5. 3x5 is 30. Add your two answers and you'll get 1830 :)
• did anyone else notice that he said one thousand seven hundred AND seventy one? The proper grammar is one thousand seven hundred seventy one.